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-----------------------------------------------------------------------
----                                                               ----
---- Present - a lightweight block cipher project                  ----
----                                                               ----
---- This file is part of the Present - a lightweight block        ----
---- cipher project                                                ----
---- http://www.http://opencores.org/project,present               ----
----                                                               ----
---- Description:                                                  ----
----     Top level of present decoder. It contains 'Key generator' ----
---- from encoder and 'inverse Present' for decoding the cipher.   ----
---- For more information see                                      ----
---- http://homes.esat.kuleuven.be/~abogdano/papers/               ----
---- present_ches07.pdf                                            ----
---- To Do:                                                        ----
----                                                               ----
---- Author(s):                                                    ----
---- - Krzysztof Gajewski, gajos@opencores.org                     ----
----                       k.gajewski@gmail.com                    ----
----                                                               ----
-----------------------------------------------------------------------
----                                                               ----
---- Copyright (C) 2013 Authors and OPENCORES.ORG                  ----
----                                                               ----
---- This source file may be used and distributed without          ----
---- restriction provided that this copyright statement is not     ----
---- removed from the file and that any derivative work contains   ----
---- the original copyright notice and the associated disclaimer.  ----
----                                                               ----
---- This source file is free software; you can redistribute it    ----
---- and-or modify it under the terms of the GNU Lesser General    ----
---- Public License as published by the Free Software Foundation;  ----
---- either version 2.1 of the License, or (at your option) any    ----
---- later version.                                                ----
----                                                               ----
---- This source is distributed in the hope that it will be        ----
---- useful, but WITHOUT ANY WARRANTY; without even the implied    ----
---- warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR       ----
---- PURPOSE. See the GNU Lesser General Public License for more   ----
---- details.                                                      ----
----                                                               ----
---- You should have received a copy of the GNU Lesser General     ----
---- Public License along with this source; if not, download it    ----
---- from http://www.opencores.org/lgpl.shtml                      ----
----                                                               ----
-----------------------------------------------------------------------
library IEEE;
use IEEE.STD_LOGIC_1164.ALL;
use IEEE.STD_LOGIC_ARITH.ALL;
use IEEE.STD_LOGIC_UNSIGNED.ALL;
use IEEE.NUMERIC_STD.ALL;
 
entity PresentDec is
        generic (
                        w_2: integer := 2;
                        w_4: integer := 4;
                        w_5: integer := 5;
                        w_32: integer := 32;
                        w_64: integer := 64;
                        w_80: integer := 80
        );
        port(
                plaintext  : in std_logic_vector(w_64 - 1 downto 0);
                key               : in std_logic_vector(w_80 - 1 downto 0);
                ciphertext : out std_logic_vector(w_64 - 1 downto 0);
                start, clk, reset : in std_logic;
                ready : out std_logic
        );
end PresentDec;
 
architecture Behavioral of PresentDec is
 
        component Reg is
                generic(width : integer := w_64);
                port(
                        input  : in  STD_LOGIC_VECTOR(width - 1 downto 0);
                        output : out STD_LOGIC_VECTOR(width - 1 downto 0);
                        enable : in  STD_LOGIC;
                        clk    : in  STD_LOGIC;
                        reset  : in  STD_LOGIC
                );
        end component Reg;
 
        component AsyncMux is
                generic (
                        width : integer := 64
        );
        port (
                input0 : in  STD_LOGIC_VECTOR(width - 1 downto 0);
                input1 : in  STD_LOGIC_VECTOR(width - 1 downto 0);
                ctrl   : in  STD_LOGIC;
                output : out STD_LOGIC_VECTOR(width - 1 downto 0)
        );
        end component AsyncMux;
 
        component PresentDecStateMachine is
                generic (
                        w_5 : integer := 5
                );
                port (
                        clk, reset, start : in std_logic;
                        ready, cnt_res, ctrl_mux, RegEn: out std_logic;
                        num : in std_logic_vector (w_5-1 downto 0)
                );
        end component;
 
        -- INVERSE substitution layer for decoding
        component slayer_inv is
                generic (
                                w_4 : integer := 4
                );
                port (
                        input : in std_logic_vector(w_4-1 downto 0);
                        output : out std_logic_vector(w_4-1 downto 0)
                );
        end component;
 
        -- INVERSE permutation layer for decoding
        component pLayer_inv is
                generic(w_64 : integer := 64);
                port(
                        input : in std_logic_vector(w_64-1 downto 0);
                        output : out std_logic_vector(w_64-1 downto 0)
                );
        end component;
 
        -- INVERSE key update for decoding
        component keyupd_inv is
                generic(
                        w_5 : integer := 5;
                        w_80: integer := 80
                );
                port(
                        num : in std_logic_vector(w_5-1 downto 0);
                        key : in std_logic_vector(w_80-1 downto 0);
                        keyout : out std_logic_vector(w_80-1 downto 0)
                );
        end component;
 
        -- INVERSE counter for decoding. It is counting down!!!
        component counter_inv is
                generic (
                        w_5 : integer := 5
                );
                port (
                        clk, reset, cnt_res : in std_logic;
                        num : out std_logic_vector (w_5-1 downto 0)
                );
        end component;
 
        -- signals
        signal keynum : std_logic_vector (w_5-1 downto 0);
        signal toXor, ciph, P, Pout, textToReg : std_logic_vector (w_64-1 downto 0);
        signal keyfout, kupd, keyToReg : std_logic_vector (w_80-1 downto 0);
        signal ready_sig, mux_ctrl,  cnt_res, RegEn : std_logic;
 
        begin
 
            -- connections
                mux_64: AsyncMux generic map(width => w_64) port map(
                        input0 => plaintext,
                        input1 => Pout,
                        ctrl => mux_ctrl,
                        output => textToReg
                );
                regText : Reg generic map(width => w_64) port map(
                        input  => textToReg,
                        output  => toXor,
                        enable  => RegEn,
                        clk  => clk,
                        reset  => reset
                );
                mux_80: AsyncMux generic map(width => w_80) port map(
                        input0 => key,
                        input1 => kupd,
                        ctrl => mux_ctrl,
                        output => keyToReg
                );
                regKey : Reg generic map(width => w_80) port map(
                        input  => keyToReg,
                        output  => keyfout,
                        enable  => RegEn,
                        clk  => clk,
                        reset  => reset
                );
                slayers_inv : for N in 15 downto 0 generate
                        s_x: slayer_inv port map(
                                input => P(4*N+3 downto 4*N),
                                output => Pout(4*N+3 downto 4*N)
                        );
                end generate slayers_inv;
                p1: pLayer_inv port map(
                        input => ciph,
                        output => P
                );
                mixer: keyupd_inv port map(
                        key => keyfout,
                        num => keynum,
                        keyout => kupd
                );
                SM: PresentDecStateMachine port map(
                        start => start,
                        reset => reset,
                        ready => ready_sig,
                        cnt_res => cnt_res,
                        ctrl_mux => mux_ctrl,
                        clk => clk,
                        num => keynum,
                        RegEn => RegEn
                );
                count: counter_inv port map(
                        clk => clk,
                        reset => reset,
                        cnt_res => cnt_res,
                        num => keynum
                );
                ciph <= toXor xor keyfout(79 downto 16);
                ciphertext <= ciph;
                ready <= ready_sig;
end Behavioral;

Line No.	Rev	Author	Line
1	4	gajos	`-----------------------------------------------------------------------`
2			`---- ----`
3			`---- Present - a lightweight block cipher project ----`
4			`---- ----`
5			`---- This file is part of the Present - a lightweight block ----`
6			`---- cipher project ----`
7			`---- http://www.http://opencores.org/project,present ----`
8			`---- ----`
9			`---- Description: ----`
10			`---- Top level of present decoder. It contains 'Key generator' ----`
11			`---- from encoder and 'inverse Present' for decoding the cipher. ----`
12			`---- For more information see ----`
13			`---- http://homes.esat.kuleuven.be/~abogdano/papers/ ----`
14			`---- present_ches07.pdf ----`
15			`---- To Do: ----`
16			`---- ----`
17			`---- Author(s): ----`
18			`---- - Krzysztof Gajewski, gajos@opencores.org ----`
19			`---- k.gajewski@gmail.com ----`
20			`---- ----`
21			`-----------------------------------------------------------------------`
22			`---- ----`
23			`---- Copyright (C) 2013 Authors and OPENCORES.ORG ----`
24			`---- ----`
25			`---- This source file may be used and distributed without ----`
26			`---- restriction provided that this copyright statement is not ----`
27			`---- removed from the file and that any derivative work contains ----`
28			`---- the original copyright notice and the associated disclaimer. ----`
29			`---- ----`
30			`---- This source file is free software; you can redistribute it ----`
31			`---- and-or modify it under the terms of the GNU Lesser General ----`
32			`---- Public License as published by the Free Software Foundation; ----`
33			`---- either version 2.1 of the License, or (at your option) any ----`
34			`---- later version. ----`
35			`---- ----`
36			`---- This source is distributed in the hope that it will be ----`
37			`---- useful, but WITHOUT ANY WARRANTY; without even the implied ----`
38			`---- warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR ----`
39			`---- PURPOSE. See the GNU Lesser General Public License for more ----`
40			`---- details. ----`
41			`---- ----`
42			`---- You should have received a copy of the GNU Lesser General ----`
43			`---- Public License along with this source; if not, download it ----`
44			`---- from http://www.opencores.org/lgpl.shtml ----`
45			`---- ----`
46			`-----------------------------------------------------------------------`
47	3	gajos	`library IEEE;`
48			`use IEEE.STD_LOGIC_1164.ALL;`
49			`use IEEE.STD_LOGIC_ARITH.ALL;`
50			`use IEEE.STD_LOGIC_UNSIGNED.ALL;`
51			`use IEEE.NUMERIC_STD.ALL;`
52
53			`entity PresentDec is`
54			`generic (`
55			`w_2: integer := 2;`
56			`w_4: integer := 4;`
57			`w_5: integer := 5;`
58			`w_32: integer := 32;`
59			`w_64: integer := 64;`
60			`w_80: integer := 80`
61			`);`
62			`port(`
63			`plaintext : in std_logic_vector(w_64 - 1 downto 0);`
64			`key : in std_logic_vector(w_80 - 1 downto 0);`
65			`ciphertext : out std_logic_vector(w_64 - 1 downto 0);`
66			`start, clk, reset : in std_logic;`
67			`ready : out std_logic`
68			`);`
69			`end PresentDec;`
70
71			`architecture Behavioral of PresentDec is`
72
73			`component Reg is`
74			`generic(width : integer := w_64);`
75			`port(`
76			`input : in STD_LOGIC_VECTOR(width - 1 downto 0);`
77			`output : out STD_LOGIC_VECTOR(width - 1 downto 0);`
78			`enable : in STD_LOGIC;`
79			`clk : in STD_LOGIC;`
80			`reset : in STD_LOGIC`
81			`);`
82			`end component Reg;`
83
84			`component AsyncMux is`
85			`generic (`
86			`width : integer := 64`
87			`);`
88			`port (`
89			`input0 : in STD_LOGIC_VECTOR(width - 1 downto 0);`
90			`input1 : in STD_LOGIC_VECTOR(width - 1 downto 0);`
91			`ctrl : in STD_LOGIC;`
92			`output : out STD_LOGIC_VECTOR(width - 1 downto 0)`
93			`);`
94			`end component AsyncMux;`
95
96			`component PresentDecStateMachine is`
97			`generic (`
98			`w_5 : integer := 5`
99			`);`
100			`port (`
101			`clk, reset, start : in std_logic;`
102			`ready, cnt_res, ctrl_mux, RegEn: out std_logic;`
103			`num : in std_logic_vector (w_5-1 downto 0)`
104			`);`
105			`end component;`
106
107	4	gajos	`-- INVERSE substitution layer for decoding`
108	3	gajos	`component slayer_inv is`
109			`generic (`
110			`w_4 : integer := 4`
111			`);`
112			`port (`
113			`input : in std_logic_vector(w_4-1 downto 0);`
114			`output : out std_logic_vector(w_4-1 downto 0)`
115			`);`
116			`end component;`
117
118	4	gajos	`-- INVERSE permutation layer for decoding`
119	3	gajos	`component pLayer_inv is`
120			`generic(w_64 : integer := 64);`
121			`port(`
122			`input : in std_logic_vector(w_64-1 downto 0);`
123			`output : out std_logic_vector(w_64-1 downto 0)`
124			`);`
125			`end component;`
126
127	4	gajos	`-- INVERSE key update for decoding`
128	3	gajos	`component keyupd_inv is`
129			`generic(`
130			`w_5 : integer := 5;`
131			`w_80: integer := 80`
132			`);`
133			`port(`
134			`num : in std_logic_vector(w_5-1 downto 0);`
135			`key : in std_logic_vector(w_80-1 downto 0);`
136			`keyout : out std_logic_vector(w_80-1 downto 0)`
137			`);`
138			`end component;`
139
140	4	gajos	`-- INVERSE counter for decoding. It is counting down!!!`
141	3	gajos	`component counter_inv is`
142			`generic (`
143			`w_5 : integer := 5`
144			`);`
145			`port (`
146			`clk, reset, cnt_res : in std_logic;`
147			`num : out std_logic_vector (w_5-1 downto 0)`
148			`);`
149			`end component;`
150
151	4	gajos	`-- signals`
152	3	gajos	`signal keynum : std_logic_vector (w_5-1 downto 0);`
153			`signal toXor, ciph, P, Pout, textToReg : std_logic_vector (w_64-1 downto 0);`
154			`signal keyfout, kupd, keyToReg : std_logic_vector (w_80-1 downto 0);`
155			`signal ready_sig, mux_ctrl, cnt_res, RegEn : std_logic;`
156
157			`begin`
158	4	gajos
159			`-- connections`
160	3	gajos	`mux_64: AsyncMux generic map(width => w_64) port map(`
161			`input0 => plaintext,`
162			`input1 => Pout,`
163			`ctrl => mux_ctrl,`
164			`output => textToReg`
165			`);`
166			`regText : Reg generic map(width => w_64) port map(`
167			`input => textToReg,`
168			`output => toXor,`
169			`enable => RegEn,`
170			`clk => clk,`
171			`reset => reset`
172			`);`
173			`mux_80: AsyncMux generic map(width => w_80) port map(`
174			`input0 => key,`
175			`input1 => kupd,`
176			`ctrl => mux_ctrl,`
177			`output => keyToReg`
178			`);`
179			`regKey : Reg generic map(width => w_80) port map(`
180			`input => keyToReg,`
181			`output => keyfout,`
182			`enable => RegEn,`
183			`clk => clk,`
184			`reset => reset`
185			`);`
186			`slayers_inv : for N in 15 downto 0 generate`
187			`s_x: slayer_inv port map(`
188			`input => P(4N+3 downto 4N),`
189			`output => Pout(4N+3 downto 4N)`
190			`);`
191			`end generate slayers_inv;`
192			`p1: pLayer_inv port map(`
193			`input => ciph,`
194			`output => P`
195			`);`
196			`mixer: keyupd_inv port map(`
197			`key => keyfout,`
198			`num => keynum,`
199			`keyout => kupd`
200			`);`
201			`SM: PresentDecStateMachine port map(`
202			`start => start,`
203			`reset => reset,`
204			`ready => ready_sig,`
205			`cnt_res => cnt_res,`
206			`ctrl_mux => mux_ctrl,`
207			`clk => clk,`
208			`num => keynum,`
209			`RegEn => RegEn`
210			`);`
211			`count: counter_inv port map(`
212			`clk => clk,`
213			`reset => reset,`
214			`cnt_res => cnt_res,`
215			`num => keynum`
216			`);`
217			`ciph <= toXor xor keyfout(79 downto 16);`
218			`ciphertext <= ciph;`
219			`ready <= ready_sig;`
220			`end Behavioral;`

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[/] [present/] [trunk/] [DecodeTesting/] [rtl/] [vhdl/] [PresentDec.vhd] - Blame information for rev 4